From Adobe Lightroom Journal:
The team would like to provide an update on several issues discovered since Sunday night’s launch. Thanks for your patience while we investigated and compiled this list.
Noise Reduction and Sharpening Not Visible on export
As mentioned here, a bug was introduced in Lightroom 5.0 where files exported at less than 1/3 of their original size may not retain Output Sharpening and Noise Reduction settings. We are working on a solution and will include it in our next update.
Incorrect photos selected when working with Publish Services
When working in a Publish collection, it is sometimes possible for the grid view to indicate that certain photos are selected, while the filmstrip indicates that different photos are selected. In this case, the filmstrip is actually correct, and any actions that are performed will be performed on the photos that are selected in the filmstrip. If you are concerned about this bug, make sure that you have the filmstrip showing while you’re working in a Publish collection, so that you know for sure what photos are selected. We are working on a fix and hope to include in a future update.
Presets Disappearing when Upgrading Catalog to Lr5
As reported here, user created presets were not migrated to Lightroom 5 with a catalog upgrade. This only occurs when the “Store Presets with Catalog” preference is checked (enabled). Within Lightroom 5, the “Store Presets with Catalog” preference will be unchecked (disabled). Please check (enable) this preference and the missing user created presets will return. Please note that this only occurs on Mac.
Revel Publish Service
The Revel Publish Service for Lightroom 5 is available here.
Lightroom 5 Upgrade Eligibility
We’ve had several questions around who is eligible for an upgrade to Lightroom 5. Any Lightroom 1, 2 3, or 4 version of Lightroom, education editions included, can utilize the upgrade version of Lightroom 5. The prior version of Lightroom does not need to be installed on the computer, however you will need the prior version serial number at the time of installation of Lightroom 5. If the prior version is still installed on the computer, Lightroom 5 will automatically pick up that serial number so you don’t need to go digging through boxes or your email.
Customers who purchased Lightroom 4 through the Mac App Store are eligible for upgrade pricing. Please see here for instructions. Lightroom 4 must be installed on the machine before installing the Lightroom 5 upgrade.
Upgrade policy for those that just purchased Lightroom 4
We’ve seen quite a few questions from those who have just purchased Lightroom 4. If you purchased Lightroom 4 very recently you may be eligible for a complimentary upgrade to Lightroom 5: http://www.adobe.com/go/pa
If you have additional workflow or how-to questions visit our user community on Adobe.com: http://forums.adobe.com/community/lightroom
To report Issues or Ideas on how to improve Lightroom, visit our Feedback Site on Photoshop.com: http://feedback.photoshop.com/